Armature for dynamo-electric machines



( No Model.)

E. W. RICE, Jr. ARMATURE FOR DYNAMO ELECTRIC MACHINES.

No. 455,887. K Patented July 14,1891.

=il i lllllllll UNITED STATES PATENT OFFICE.

EDWIN \VILBUR RICE, JR, OF LYNN, MASSACHUSETTS, ASSIGNOR TO THETHOMSON-HOUSTON ELE JTRIC COMPANY, OF CONNECTICUT.

ARMATURE FOR DYNAMO-ELECTRIC MACHINES.

SPECIFICATION forming part of Letters Patent No. 455,887, dated July 14,1891.

Application filed March 21, 1891.

T0 aZZ whom it may concern.-

Be it known that I, EDWIN WILBUR RICE, Jr., a citizen of the UnitedStates, residing at Lynn, in the county of Essex and State ofMassachusetts, have invented a certain new and useful Improvement inArmatures for Dynamo-Electric Machines, of which the following is aspecification.

My present improvements in armatures for dynamoelectric machines relateto means for holding the coils in place.

The invention relates particularly to that class of armatures known asthe Gramme type. "When armatures of this type are of quite large size orhave a considerable length, the coils or wires on the inner side of thecore sag in the center, and when the machine is running the Wires, underthe influence of the centrifugal action, chafe each other, so that theinsulation is eventually impaired, and the constant bending andvibration of the wires may even sometimes be the cause of theirbreaking. To overcome this difficulty, 1 cmploy a support for the coilswhich'holds them securely in position against the inner face or surfaceof the armature-core and prevents Such objectionable and dangerousdisplacement of the wires.

- In the accompanying drawings, Figures 1 and 2 are respeetivelyapartly-sectioned end view and an axial section of an armature providedwith my coil-supporting device. Fig. 3 shows a modification of saiddevice.

The Grainme armature to which my invention is to be applied is supportedin the usual manner by means of one or more frames, spiders, or supportssecured to the shaft and engaging with the core of the armature.

Figsl and 2 illustrate an armature A, supported from the shaft bysupports or spiders C and fitted with the supports S S S S S' S, as manyas may be necessary in each case, and the support S (shown partly insection) will illustrate the construction. G is a cast segment of metal,such as gun-nletal or brass, although other materials than metal may beemployed, if desired. Its face has the same curvature as the inner partof the armature when the coils are in position. Between each of thesegments G and the hub is a permanent jack-screw s or any otherextensible or com- Serial No, 385,777 (No model.)

pression device adapted to force the segments G firmly against the coilsand hold them in position against the inner face or surface of thearmature-core. The screw .9 has a portion D, shaped to be engaged by awrench or otherwise turned in a ing E, projecting from the hub, andthere is provided a set-nutn,whieh locks the jack in position when it isextended to the desired amount.

Fig. 2 is a section through the armature, showing the relative positionsof the spider which supports the armature-core and the coil-supportsdescribed above.

Fig. 3 is a modification of the device. In this case a strap R is strungbetween each of the bolts l3, which secure the halves of the spidertogether, and the jack-screw s enters a lug at the middle of this strap,as shown.

In case the segment (i is made of metal, it is of course understood thatit is properly insulated from the armature-coils by mica or otherinsulating material, this insulation being indicated in the drawings bya heavy line between the segment G and the coils and marked 1.

The invention is not limited to the precise forms and arrangements shownfor supporting the coils, as mechanical modifications might readily bemade without departing from the invention, which consists, broadly, inthe combination, with the coils, of the segments individually adjustableto hold the coils in position, as described.

\Vhat I claim as new, and desire to secure by Letters Patent, is

1.. The combination, with a ring-armature having its coils woundthroughthe ring and supports therefor engaging with its core, of two or moreseparate segmental coil-supports bearing against the inner side of thecoils and radiallyadjustable,substantiallyasdescribed.

2. The combinatiomwith a ring-armature having its coils wound throughthe ring and supported from the shaft by devices engaging with its core,of an independent radiallyadjustable coil-support. bearing against andsupporting the inner side of the coils.

3. The combination, with a ring-armaturc having supporting devicesengaging with its core and having its coils wound through the ring, ofindividually adjustable segmental bearingblocks supporting the in newsides oi the coils.

l. The combination of the ring-armature core, the armature-suppoirtsengaging there with, the coils wound through the ring, the segmentalblocks bearing against said coils, and the adjusting-screws engagingwith said blocks and with an interior abutment.

5. The combination, with a ring-mmature core and the coils wound throughthe ring, to

of armature-supports engaging with said core, and independent segmentalblocks bearing against: said coils and supported by jack- SCIGWS fromthe armature-shaft.

ED\VIN WILBUR RICE, .TR. Witnesses:

JOHN W. GIBBONEY, BENJAMIN 1;. NULL.

